A urine sample from a 26-year-old woman is examined, and an organism is observed that displays "jerky" motility. This organism is classified as a(n):
a. amebae.
b. coccidia.
c. flagellate.
d. ciliate.
C
The organism that displays jerky motility in a wet mount is Trichomonas vaginalis, which is classified as a flagellate. The organism possesses flagella and long proteinaceous organelles used for motility and is transmitted through sexual contact.
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The two strands of a DNA molecule contain nitrogen bases which are
A. identical. B. parallel. C. complementary. D. proportionate. E. random.
Which of the following prenatal tests can be
performed earliest in a pregnancy?
a. amniocentesis b. obstetric sonography c. fetoscopy d. chorionic villus sampling e. preimplantation genetic diagnosis
A mountain rain shadow is the ____
a. arid area on the windward slope b. wet area on the windward slope c. arid area on the leeward slope d. wet area on the leeward slope e. arid area on either slope
Calcium binding to ________ initiates skeletal muscle contraction
A) actin B) tropomyosin C) myosin D) troponin